Like codepage 437, it aligns withASCII codepoints 32–126, and has additional codepoints including letters withdiacritics and other symbols. It differs from code page 437 in using otherdingbats at code points 0–31, in exchanging thebox-drawing characters 176–223 for theHebrew alphabet and other symbols, and exchanging code points 158, 236 and 254–255 with the symbols forsharp S, line integral, cubed and macron.
The Atari ST family of computers contained this font stored inROM in three sizes; as an 8×16 pixels-per-character font used in the high-resolution graphics modes, as an 8×8 pixels-per-character font used in the low- and medium-resolution graphics modes, and as a 6×6 pixels-per-character font used for icon labels in any graphics mode.[1]
All 256 codes were assigned a graphical character in ROM, including the codes from 0 to 31 that in ASCII were reserved for non-graphicalcontrol characters.
The following table shows the Atari ST character set. Each character is shown with a potentialUnicode equivalent if available. Differences fromcode page 437 are shown boxed.
Although the ROM provides a graphic for all 256 different possible 8-bit codes, some APIs will not print some of these code points, in particular the range 0–31 and the code at 127. Instead they will interpret them as control characters.
^Actually a blank space but used as C string terminator.
^ab14–15 (0Ehex–0Fhex) are 2 pieces that form anAtari "Fuji" logo, sometimes used together as an alternative to the title "Desk" for the leftmost menu in Atari ST software. They are not proposed for Unicode.[9]
^abCodepoint 158 (9Ehex) is the Germansharp S (U+00DF, ß) produced by a German Atari ST keyboard'sß key. Codepoint 225 (E1hex) is the Greek lowercasebeta (U+03B2, β)homoglyph. Code page 437 uses codepoint 225 to represent both characters; the Unicode Consortium's code page 437 mapping recommends mapping codepoint 225 to sharp S (U+00DF)—presumably based on its more frequent use as the sharp S, despite its surrounding code points being Greek characters.[10]
^227 (E3hex) is the Greek lowercasepi (U+03C0, π), but early code page 437 fonts such asTerminal use a variant of pi that is ambiguous in case, and therefore can be used for the Greek capital pi (U+03A0, Π) or the n-ary product sign (U+220F, ∏).
^228 (E4hex) is both the n-ary summation sign (U+2211, ∑) and the Greek uppercasesigma (U+03A3, Σ).
^230 (E6hex) is both themicro sign (U+00B5, µ) and the Greek lowercasemu (U+03BC, μ).
^234 (EAhex) is both theohm sign (U+2126, Ω) and the Greek uppercaseomega (U+03A9, Ω). (Unicode considers the ohm sign to be equivalent to uppercase omega, and suggests that the latter be used in both contexts.[11])
^235 (EBhex) is the Greek lowercasedelta (U+03B4, δ), but it has also been used as a surrogate for the Icelandic lowercaseeth (U+00F0, ð) and thepartial derivative sign (U+2202, ∂).
^236 (EChex) is used for the∮ symbol on the Atari ST while code page 437 uses it for the∞ symbol, which in turn the Atari ST places at 223.
^237 (EDhex) is both used as theempty set sign (U+2205, ∅), the Greek lowercasephi, the Greek phi symbol in italics (U+03D5,Φ) to name angles, and the diameter sign (U+2300, ⌀).
^238 (EEhex) is both used as the Greek lowercaseepsilon (U+03B5, ε) and theelement-of sign (U+2208, ∈). Later it was often used for theeuro sign (U+20AC, €).
UsingAlt codes, users can enter a character by holding down theAlt key and entering the three-digit decimal code point on theNumpad. This provides a way to enter special characters not provided directly on the keyboard.[2]
The Atari ST character set long predates the introduction of the euro currency and thus does not provide a code point for theeuro sign (U+20AC, €). However, some software (such asCalamus) utilizes code point 238 (0xEE) for this purpose.[12][13] This code point is normally assigned to the mathematicalelement-of sign (U+2208, ∈), and to the Greek lowercaseepsilon (U+03B5, ε) in code page 437.Alternatively, the rarely usedlogical conjunction sign (U+2227, ∧) at code point 222 (0xDE) could be replaced by the euro sign.[14]
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